可自由通过细胞膜的物质是A．蛋白 B．K C．Na D．Ca E．肌酐

已知y=(2m-1)xm2-3是正比例函数，且函数图象经过第一、三象限，求m的值．

日常生活中，我们常常接触到下列物品：①软排球②铝合金门窗③橡皮塞 ④大理石板⑤羊毛衫⑥铅笔芯⑦保鲜膜．其中主要是由有机高分子材料制成的一组是（　　）

A．①②③⑤

B．①③⑤⑦

C．②③④⑤⑦

D．①③⑥⑦

如果承诺期限届满，受要约人未作出承诺的，则（）。

A.要约延期

B.要约中止

C.要约失效

D.要约效力待定

阅读理解。

     My parents influenced us with the concepts of family,faith and patriotism when I was

young.Even though we struggled to make ends meet,they stressed how fortunate we were

to live in a great country with limitless opportunities.

     I got my first real job when I was ten.My dad,Benjamin,injured his back working in a

cardboardbox factory and was retrained as a hairstylist.He rented space in a little mall

 and gave his shop the fancy name of Mr Ben's Coiffure.

     The owner of the shopping center gave Dad a discount on his rent for cleaning the

parking lot three nights a week,which meant getting up at 3 am.To pick up trash,Dad

used a little machine that looked like a lawn mower.Mom and I emptied garbage cans

and picked up litter by hand.It took two to three hours to clean the lot.I'd sleep in the

car on the way home.

     I did this for two years,but the lessons I learned have lasted a lifetime.I acquired

discipline and a strong work morality,and learned at an early age the importance of

balancing life's competing interests-in my case,school,homework and a job.This really

helped during my senior year of high school,when I worked 40 hours a week flipping

hamburgers at a fastfood joint while taking a full load of collegeprep courses.

     The_hard_work_paid_off.I attended the US Military Academy and went on to

receive graduate degrees in law and business from Harvard.Later,I joined a big Los

Angeles law firm and was elected to the California state assembly.In these jobs and in

everything else I've done,I have never forgotten those nights in the parking lot.The

experience taught me that there is dignity in all work and that if people are working to

provide for themselves and their families,that is something we should honor.

1．According to the text,the author thinks________.

A．he is lucky to have many chances to get a job

B．it is difficult to find a job to make ends meet

C．his parents are full of complaint about their life

D．it is not acceptable to live in such bad conditions

2．In order to get a discount on rent,________.

A．his father had to work as a hairstylist

B．his father had to work in a cardboardbox factory

C．they had to clean the parking lot three nights a week

D．his father had to pick up litter by hand three hours a day

3．Which of the following is NOT true of the author?

A．He got the graduate degrees from Harvard.

B．He took a collegeprep courses at high school.

C．He took a parttime job during his senior year.

D．He regretted having worked in the parking lot.

4．What does the underlined sentence "The hard work paid off" mean?

A．The author got a high pay by working hard.

B．The author complained of the hard work.

C．The effort which he made had no effection.

D．The hard work was worthwhile for the author.

5．We can learn from the text that________.

A．it is unimaginable for a child to help his family

B．it is honored to work for one's family as a member

C．it is unnecessary to keep work rules of behaviour

D．the harder the work is,the more interest one shows

邓恩的政策信息转换分析模式中，通过评价方法分析，提供的信息是（）。

A.描述性的解释因果关系

B.评价性的决定政策的价值

C.指导性的提出政策的行动

D.评价性的解决问题的政策